ABSTRACT
Building the conservation-oriented society, the reasonable development, saves and the effective protecting water resources is an arduous task. Be centralized according to the university water used time, the water consumption change major characteristic, analyzed the campus original water supply system existence cost to be high, the reliability was low, the water resources waste, the pipe network system treated the consummation the question. Proposed that draws water the way which using the running water hydraulic pressure water supply and the water pump unifies, and matches by the inverter, the soft starter, PLC, Micro reveals the compensator, the pressure transmitter, the fluid position sensor and so on. according to the network management pressure, controls water pump's rotational speed through the inverter, causes in water pipe's pressure maintains at throughout the appropriate scope, thus may solve the problem which the floor high pressure is too insufficient when small current capacity the energy consumption is big.
Moreover the water pump consumes the electric power and the electrical machinery rotational speed is proportional three cubed the relations, therefore the water pump velocity modulation movement's energy conservation effect is obvious, the average power consumption usual water supply way saves 40%.The union uses the programmable controller, may realize the main pump frequency conversion, the auxiliary pump soft start, has the short circuit protection, the overflow protection function stably, the work reliable, lengthened electrical machinery's service life greatly.
Key words: Constant pressure frequency conversion water supply, PLC, differential pressure water supply, automatic control
